Image Processing Device, Image Processing System, and Control Method of Image Processing Device

1. An information processing device connected to a power source and another information processing device, comprising: a first arithmetic-processing unit that operates by predetermined power generated based on power supplied from the power source; a connection control unit that includes a connection control circuit switching between connection and disconnection of a path connecting the first arithmetic-processing unit and a second arithmetic-processing unit included in the other information processing device; first and second input paths that respectively supply first and second control signals giving time differences by supplying power supplied from the power source to input terminals of the first and second input paths respectively through different resistors, the time differences varying according to resistance values of the resistors; a signal output circuit that transmits the first control signal to make the connection control circuit effective or ineffective through the first input path, and that transmits the second control signal to control switching of the connection control circuit through the second input path; and a switch that controls connection and disconnection of the first and second input paths, disconnects the first and second input paths when the first arithmetic-processing unit is connected to the second arithmetic-processing unit, and then connects the first and second input paths after a predetermined time passes, wherein the connection control unit starts operation by receiving a supply of power from the power source when the first arithmetic-processing unit is connected to the second arithmetic-processing unit, that makes ineffective the connection between the first arithmetic-processing unit and the second arithmetic-processing unit when receiving the first control signal to make the connection control circuit ineffective when the first and second input paths are disconnected by the switch, and that makes effective the connection control circuit and connects the first arithmetic-processing unit and the second arithmetic-processing unit based on the second control signal that is transmitted from the signal output circuit when the switch connects the first and second input paths after the predetermined time passes and the connection control unit receives the first control signal from the signal output circuit to make the connection control circuit effective.

2. The information processing device according to claim 1 , wherein the predetermined time is at least long enough that operation of at least one of the connection control unit and the first arithmetic-processing unit becomes stable.

3. The information processing device according to claim 1 , wherein the connection control unit disconnects connection between the first arithmetic-processing unit and the second arithmetic-processing unit when a failure occurs in the power supplied by the power source to the first arithmetic-processing unit.

4. An information processing system comprising: a power source that supplies electric power; a plurality of information processing devices; and a connection mechanism that enables insertion and removal of the at least first and second information processing devices, the connection mechanism including one or more paths to connect all of the information processing devices that are inserted by a single path, each of the information processing devices including a first arithmetic-processing unit that operates by predetermined power generated based on power supplied from the power source, a connection control unit that includes a connection control circuit switching between connection and disconnection of a path connecting the first arithmetic-processing unit and a second arithmetic-processing unit in another of the information processing devices, first and second input paths that respectively supply first and second control signals giving time differences by supplying power supplied from the power source to input terminals of the first and second input paths respectively through different resistors, the time differences varying according to resistance values of the resistors, a signal output circuit that transmits the first control signal to make the connection control circuit effective or ineffective through the first input path, and that transmits the second control signal to control switching of the connection control circuit through the second input path, and a switch that controls connection and disconnection of the first and second input paths, disconnects the first and second input paths when the first arithmetic processing unit is connected to the second arithmetic-processing unit, and then connects the first and second input paths after a predetermined time passes; wherein the connection control unit starts operation by receiving a supply of power from the power source when the information processing device is inserted in the connection mechanism and the first arithmetic-processing unit is connected to the second arithmetic-processing unit via the connection mechanism, that makes ineffective the connection between the first arithmetic-processing unit and the second arithmetic-processing unit when receiving the first control signal to make the connection control circuit ineffective when the first and second input paths are disconnected by the switch, and that makes effective the connection control circuit and connects the first arithmetic-processing unit and the second arithmetic-processing unit based on the second control signal that is transmitted from the signal output circuit when the switch connects the first and second input paths after a predetermined time passes and the connection control unit receives the first control signal from the signal output circuit to make the connection control circuit effective.

5. A control method of an information processing device that includes a power source that supplies electric power to a first arithmetic-processing device that operates by power supplied by the power source, the method comprising: starting operation by receiving power supply from the power source when the first arithmetic-processing device is connected to a second arithmetic-processing device in another information processing device; transmitting a first control signal via a first input path to make a connection control circuit ineffective, the first input path connected to the power source via a first resistor with a first resistance value; transmitting a second control signal via a second input path to control switching of the connection control circuit, the second input path connected to the power source via at least one second resistor, each having a different resistance value than the first resistance value, thereby producing the second control signal at a different time than the first control signal, the connection control circuit switching between connection and disconnection of the first arithmetic-processing device and the second arithmetic-processing device based on the second control signal; making ineffective the connection between the first arithmetic-processing device and the second arithmetic-processing device when the first control signal makes the connection control circuit ineffective, while disconnecting the first input path and the second input path from a signal output circuit by a switch; and making effective the connection control circuit and connecting the first arithmetic-processing device and the second arithmetic-processing device based on the second control signal that is transmitted from the signal output circuit when the switch connects the first input path and the second input path to the signal output circuit after a predetermined time passes, by transmitting the first control signal from the signal output circuit to the connection control circuit to make the connection control circuit effective.